SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33d5bb8ebe3ca45f265fd18d001c9994a9a77a20646aa58a2290b0f54a0b3a24' 
  AND token = 'CHPfG3XjhGJo3KxN4L0Jhv7cqpntkwJq4kPkdtUfzqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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