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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce199fdfc570ba7571ab43de81d0ca2bec8215a6132cc60b6a705f528d22e331' 
  AND token = 'c+ZA5xCD93SacKO2o7GbLwkDtpM/FTXjdaAMYTv8npk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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