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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e2f3a6b3f5b9bade6d9ba14139ffa0d44598b806e8ab868efaf02c25a31ad3f' 
  AND token = '8xzoKR2C5ErFs5fqkvxoe+tvRALFnJ+50KCD5W/Tqys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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