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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8741fb5ac3dfe1c2149b56db0902ef6cc83e3bffe3998e19b673391e8f2acda2' 
  AND token = 'bsY/EieMd/9kllMd7Goc+XwKn1yqATI9rRRS+tayqmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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