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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '933e5dee690da87488ad8f3b08822f04f7cf3af33572f176cd2e2531c1407905' 
  AND token = '14NZLrAivL69h8/1L0Xv4aNnenic04HI042WmY1WJrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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