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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc9887e6eb29ad841aabc99acfd8aae969419e5edd5c8b747b3b54923ae31a57' 
  AND token = 'jv5g+9B/7hrx2Pvf3vvn5JSXYypquelaDJlvpH2liTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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