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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5911bd9207a4ec5c2377d69a786ec9db52cdfd755174bc3dd2b27e09bce6ddbf' 
  AND token = 'uk1WR3D1ajcIvPiiw3nzGGOozwY/moaMJ9olYmYueC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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