SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12e54601719fa81c610bed2b4fcf2d3bd308cf39545c56490b0a202d47bc6774' 
  AND token = '7qhZY8YZHiuTKAF5SSeWgwdi5YBHa152nUXiHIYRDMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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