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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '637921b1b3f614bcadd7e56bbd4495d254efa2291fb33a67ff39603e09b08b8c' 
  AND token = 'MkLvo1tS6PseEX+/yTwmfkfr9HjYupL6vNpDwJtVrHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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