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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe9ac110d47e9e372eda54c063a81a225c0f7d8071bc64e981e088e7609592ec' 
  AND token = 'O7RxAptGwM9JL0FKII5gs1yg7u2rab+TmQlmpbQCctI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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