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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b75fb185120e756880498d21857e1de79d00d40bb3e211a5604adad55eca8f5' 
  AND token = 'Cd7tO4dkerMmA4+s+W0Vd0SJI+CvAxLkiealAlgrBhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}