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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a735fb04f6d1bf42fe33828f1bea486385ee53390de7f0fcdf9c59e51942e6ff' 
  AND token = '4FRU+njXNGjr1A0ZbXW9PxXb699i6cVCDNodBidI6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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