SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '667ac419deffbee844897e552e1c195847b409d29af49538095d8cf76b9c3c9b' 
  AND token = 'kGKYMgqMATfAOZ1hmmPJCmPwG6iT2J1+GuEv6lWMoVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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