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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e58db10cded63237173f18657605c0aa6cef9a330364bdf7fef4020dd389f7d9' 
  AND token = '+eV+y+ba4wYW4cCdhCy+YEP3WAXCB5cMxxzgJc5BAaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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