SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '827fa441b692bd7109d9ac068cc6188a162b5330dc2eb90bcd85560530bf95d9' 
  AND token = 'euW4BFR2Z5XeTTqKdOa99VQQ0/WXfM3QRhwGMY2Hkp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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