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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14dc3356daa1372a3d3d91f30fed152d189c659dd972bf3f08dd217cd3d117a8' 
  AND token = 'dVREyIutMBp1NxWwKgZOfceuJilAz/l+ff7hKsyvvuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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