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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d7cea5d5c865220661417f5e13e2fda545965561d973d8abeeefab8d9572031' 
  AND token = 'CWucJLjAS1GZfT6PqKU0QNHNmvp46bTZ2V0NN1TmyGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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