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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ffd9e208eb879333b4c3c263894296af8fab9b286db21823ba26fe8c86b1af' 
  AND token = 'WgBMavxh1Oq5PMywUPRAg3bgl5Hhr4aDDifeW7XHQIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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