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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa80e975e5db8b3755213a67282c1df49a858b31bcab9de11a8744de595972d9' 
  AND token = 'dZM9K8/+8YR1LvblfM9/SUYE0M2LQfSoU/VR8o8DuH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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