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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ade19af9c035c9922aa0272ceb76ebcb1697ae9a692d895a81701831e427953' 
  AND token = 'dMqUq2n19RxCgrfU6cHodlyCAqE4ukD5CPvPNm2Zj88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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