SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dff486a667ef8d91c37b7d0f1aae0894620ba3d5a08104f63b482d857bde470' 
  AND token = 'Kh3woOSV7xKcYLJF14QopjwffBjitJ0Cvvv/WoIuzrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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