SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4894c32d813aaffddcb28fb89df1492c1f34e6223025a0f9ae7ab8ad9118fa12' 
  AND token = 'vcxFj5uD3JCGMAwUw9iAhzXRRNS7dKWvvgpS4UQK2UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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