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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f0b570c7230afa72987f6e82c80a6efed7f2754f7fae26acba4962ef9ddf9d9' 
  AND token = '2Irqmch1JJimh+fK0cTgd3GmRZXYoUpj5/T+N7oFaR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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