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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a6cd9348b6003beacaf7964c583be015a8cfec3db1876a5e8555458a8c36f84' 
  AND token = 'neig+L8gQeueZZgI5LS9lxKxDTmMMMpnznWB6kMg7z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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