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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc52248348686a7407b7a5dab2eac2b3bd5876b852b0a37f59d54b3bb36651fb' 
  AND token = 'QUXgOAUPV6nVassXWhyHe54sKDpY3ee8ut5oscVa1Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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