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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36738be780554b4d757a3ddb30fe96553432f3ce3c1434df215d17881cdc5188' 
  AND token = 'n2Zu9q4xlJhJdseofxD3+ZFzujlxkE3CcmlOo9iPRSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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