SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd62f6c535c5008d0c4f669977434f772c3ac8496d98bda284473cdb66b1b5883' 
  AND token = 'ASS/YCtpuAWKKb4PEE0k8hgSKJDq1M99tBHKGd6+EIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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