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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daca1f8f3d4cd6f391ff76b30da1c82078a90e2981c29ed93fc81da173677652' 
  AND token = 'gPn9GWd+Y2RJeeNDBEfPuYDGlBg56oMeCk+nei65ln4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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