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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31c5e8ce2b72ee9f30e17d8aec142babfa16d9f725f1d044795b56bb35ace72c' 
  AND token = 'a07yQTT6ZRk+jQX88Lwf6+dNFrjmtKA91473UxTQ2HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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