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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5c98ac8f38105d1c71cad4a297fb65700b78f5364f0a9f00f7652195aaef924' 
  AND token = '0lKtQGfZ51Wnua8himIa7bWI0kR7YShf3/mCX+4Rs38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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