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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12c8701e6d5340fce74abd00c4e8d914cdc126801912d07963805e7601fbfded' 
  AND token = 'nG4+csVNRmdBSy8DccnASzK+n+LwC9WeN5nZYn7vLrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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