SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2cc4c67b4f28587c8f0b189e48d803dd6801b7119d186f5bef5a55477a1612c' 
  AND token = 'sRDKLkjnmh0QE5CEjBy+IT7nsNRu3t0lWKX9w7kUBqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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