SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f04f55f1390978dadc5a0787c8b314377217f5969548c1212e8234ede72ce56' 
  AND token = 'mzHAkCzeJVqb8tcZ2BNZKjanLdnBv+rgiF8cvw9EsYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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