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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05244b644f80f5ecc32d5d60f399e3c8788ca1d54c4577c579d970467443fe47' 
  AND token = '0xFsvYYApSFTnb5FaGMXsWHy19+pxnPczYMMBTn+Fbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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