SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf213fec3d11b1bb72a89a0caa7547216af5eed7b03dbd14461e11c1813854c9' 
  AND token = 'TJwNYIWJE0ZvLZMS+SyTLlBOZ8Tdr+8CcXXrwhFGrzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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