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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcc3c95b980e21c5db8600f0872fc4dda7df331e65a9d9204100ff8151079525' 
  AND token = 'LGrpSt5xUOioTOcv8FqEjryGszD30SV7G1Po1Lbbox4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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