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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81b4a00829c67ec61e889e20b3648b10451eb2f6f56f330420480ef819c36407' 
  AND token = 'ZbcotYy0mIABg/Enr7o/f1ahVP1gsGoeTViWRk8PFBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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