Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21304d3d9055842e937f15e86f4883845a04f4620e459a1148a72027eaa2c9df' 
  AND token = '790ghjgKnJo/MhL3ADzwfftkR2siAJrKkuTQ3jl3WuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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