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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '347b61bae3ef213cf17385917d06eff5523c28adcb93c5cde2355d59cf50bc92' 
  AND token = '2ieV/XRCjNOxUJbhnSJ3XhXOXs6+U8WId3odKJ/QV1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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