SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60590943defc10462098e78d98efd556c70a87f10d05d65ecaacb96a82143ba5' 
  AND token = 'Sf34NYxnn+2+VhaPASV9xlzA8rRvFGO7l//euIj2KL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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