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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9632f7d57de43f0e1e4d2861d949cec528c66492ca1e14879ab2d2cebcf2eb9' 
  AND token = 'ARIgJIQXV0MOP3Mg6wf05sEs9F6yLdhoVwwpsP59AsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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