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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd27796cdcf2dc4ee7e3b18c1d7ab55e7ca5a9348f7609ad791eec0b339700807' 
  AND token = 'Z2U0uZvDyYlt6Kuj9vc/CDpODjYrpz34g1XtnLP5dXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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