SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8f7f1d1788118531599d9f2215675fcea585c98b6c4bd7db816460774fc65ec' 
  AND token = 'iURwd/gZRhvKOJ6cf8GMSh6eX4XrVSfchJrjuETzQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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