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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd17881025ab9f654cadeb912f56d5ee9b7ece7cdbe298bf38ca5603d3e3eda4' 
  AND token = '0LzwhlLS6J4RzCobUuAO3Qpc/tklpMKT3iCFhPc4pY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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