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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1049cf9a1b776eb9d14bb757b3c7a22f04b335a616339a020ad2341715046da8' 
  AND token = 'qVQ1Y+oQ9ejasL8CDkXY8TJSmFU0AbAoKidqKnO1lMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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