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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69f4908640929f44206a2d34c099b45433f27e2a124079fc3b1bafb93c5e9bd4' 
  AND token = '8gnBwqvXfS+tbyMTUqWi8udMMVnAlzraRPD9aWF1wHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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