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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97a8196d85d4ffdccedd95003e9c356e36b7d95c29692be6f0d6e3df00168e1f' 
  AND token = 'baoRp8bM9RLR3lWSwSjgyH8VtG0UgUDf2YbitlyDkH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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