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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abfc70c07b04a88fdacd5b3d46f12907a2f70c89b54e3bb82866963e575536de' 
  AND token = '6uTWxDvvkdqirkDVx3J8XFPn5nH/9diFJGsoHgNNp9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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