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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe93d50bc43ea388eed6a22bf8e5e0ddaa84af1b6c2b97790805a726494d22dd' 
  AND token = 'ngljQZ8Tmzt5EeczZXZfLv4XvBSxK4ruZTXJSmsBttk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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