SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c6f51a1f8069b2fb44d3ab737ff515862d032446331dbbf6d54de6883c357ce' 
  AND token = '7vPKKoT20KZWD/VS/Liho/Is0qzoxSNKQoQ10grA62s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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