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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ee51c7f303ca64c8d20a4aa84498f17b7d35c4a3a503e2dfa53c19abd3c9e8e' 
  AND token = 'FoTie8qDk0E44c0Ooddz6L8mpJXGuNIJ+0vCUCMWV5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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