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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47020238046c2fab11a6d994d5a8021605a7e857afd276aea1bfc81f4c336017' 
  AND token = 'jfexkYfJiIT8TXw0nGdB93fkx1YWLFrqchfjncElsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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