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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fa77e1c61aed65bcb9b6acf253ae683b6fc6d865b986a855f3c9941cb85825b' 
  AND token = 'LGcAgENtjhxc2h7wUkb59NQAktrF2vjKZkRj0Owc0MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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