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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62c7b274d22fe5b7ae05d6670946e2f595b8fd28afd39cf71dc0a939586a370f' 
  AND token = 'd1F8oMOx4fQ9QPZHa5nsSSdhyI0AuJpmIQwm3HUKquw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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