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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccc99719f98f7bb16f528a65c696585e8d233fcb551663420556ed5f069e2783' 
  AND token = 'n4xkGe1FugImz0UpfgTKQEHPod0kyGcuXPOxY0L4WdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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