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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '108fea1acc1ddbc35319c75f4cc21fb6448174bab5e643b2b3f9caa5bea53dbe' 
  AND token = 'RMcsIvsluZsjmCOUxRVLxunBTPhx9dIM5Pmv7eF9afg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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