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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e8958719839e8c59738c047d6ef91c7d978895ed6b1c72b2e9048a147ea7f15' 
  AND token = 'Ji6xPndd+S6WXRfVYgurVnHW09QkFhev5ODBJLHOva8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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