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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '709e09684e148d37d5d8bf17ca44f82dbd76f5ba8561467e19043553429568c6' 
  AND token = 'x2IIXbeGtBL9weicvnZe/9dPmHS3MCl2eHd2HTB2jjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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