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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21dce76f58deb0b3205c14f40d892bd1c78f3b7281d258a2c3bf147079078264' 
  AND token = 'iHdFUZLATA0tuSx5G7FK26LbFVBZVIA70zbpBhayLrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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